I haven't ordered the books yet, but I am assuming that the foam notebooks are similar to something I did in the S-100 / SS-50 home computer era (mid 70's). I must warn the readers of the eventual outcome. After 20+ years of being embedded in foam and south Florida humidity most of the IC's lost their legs. Some of the foam became rather crumbly too. It was no big deal losing a few hundred old TTL and LS series chips, but losing my collection of Mostek MK50240 top octave dividers sucked.....Until I got the idea of soldering the stubby remains of the chips onto some machine pin IC sockets.

Maybe most normal people don't keep things forever, but I still have my collection of germanium PNP transistors from high school. Great for making guitar fuzz boxes.

Gee,

I keep 4 CK722 germanium transistors in a frame on the wall, along with a TI7400 and a few other notables.

I have had semiconductors in foam, some for 35+ years, never had a lead corrode. Foam turns to grimy dust thought. So I have to agree with you it most likely is the Florida salt air. No wonder all the folks I see in Florida seem to look so old!

Well you can always read the abstract on the site!
But briefly, the idea is that if you have ideal square-law devices they only generate even harmonics, and then if you put two of them in push-pull the even harmonics cancel.
The devil of course being how to get ideal square-law devices.
And then there's the little matter of how that helps to make efficient class-A.
Ian's a pretty smart guy. He's also a great human being: quit his job to care for his ailing Dad, doing odd jobs to sustain himself. How's that for caring for your elders. That in itself earned my respect big-time.

Hi Jan,
Just ordered my copy.
I now remember Ian's interest, back in 1995 in Electronics World, for what was called "D2S", "curvilinear class A" or, in France, "quadratic class A" by Hephaistos in L'Audiophile. Another nice circuit Ian submitted was an enhanced Sokol's equalizer for closed box, in fact an adjustable transform. I built it, it works very well.

Hi Jan,
Just ordered my copy.
I now remember Ian's interest, back in 1995 in Electronics World, for what was called "D2S", "curvilinear class A" or, in France, "quadratic class A" by Hephaistos in L'Audiophile. Another nice circuit Ian submitted was an enhanced Sokol's equalizer for closed box, in fact an adjustable transform. I built it, it works very well.

I don't know about that Sokol circuit; can you send me something?
Anyway, Ian makes a distinction between square-law class-A (your quadratic class-A) and curvelinear class-A. Similar but not the same.

There is a logical explanation for that......they ARE old! I am getting dangerously close to 60 myself, but I refuse to grow up, because when you grow up, you grow old. I will remain a kid forever. Always keep learning, because when you stop learning, you start dying. In that quest I ordered both books yesterday. When The book of Morgan 4th ed comes out I will have that one too.

Quote:

I keep 4 CK722 germanium transistors in a frame on the wall

I fried all of those about 40 years ago. I still have some house numbered little guys, but I used to collect the big TO-36 germanium from the backs of 60's car radios. You could crank them pretty good before they blew up. I bought a box full of 2N3055's in the late 60's. Didn't blow them all up. I still have some of them.

__________________
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......

There is a logical explanation for that......they ARE old! I am getting dangerously close to 60 myself, but I refuse to grow up, because when you grow up, you grow old. I will remain a kid forever. Always keep learning, because when you stop learning, you start dying. In that quest I ordered both books yesterday. When The book of Morgan 4th ed comes out I will have that one too. [snip].

Answered Woody Allen to the reporter: "No, I don't want to achieve immortality through my work; I want to achieve immortality by not dying".